Malicious PDF — malware analysis report

Static analysis result for SHA-256 42be2a083ba8ffc9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 03:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f0a76370afaee93d13e965cb7312548 SHA-1: 7e4067df075602a802940b5cdcd566c44b7fd0b5 SHA-256: 42be2a083ba8ffc9d12d77940384fb435dfab9de3194c773e30c3b7c11ede576
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=google+android+auto PDF link annotation
    • http://turnwealthy.com/ckfinder/userfiles/files/jukugiwupovekaramenimi.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/levaxopoboduvajom.pdfIn PDF document text
    • http://imaginove.eu/data/Files/pebob.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/dufipenolodefatugelub.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/47930918461.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/nujan.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • http://htwy.com/upload/file/69818949414.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5e95b924---3944719659.pdfIn PDF document text
    • http://packamate.com/userfiles/wabare.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/lifoxeta.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/65090957135.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/rodigubemejalinefisoxekox.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/70221747666.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/kavikorijinovo.pdfIn PDF document text
    • https://angkalaris.com/contents/files/43538502822.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/58053953438.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/fuwari.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/gekiwarabidutuxijelese.pdfIn PDF document text
    • https://dukupahit.com/contents/files/36855455067.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 17348 bytes
SHA-256: 9bf18ad53c1293e6ec80da652e868dc99d9e5ab72eb5d446d619ff2f0283d9f9
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10396 bytes
SHA-256: 4acb4bc61e2e0bdf9c92ad94e8cefb9f0e214d87237d39b5c2490dbda934f1c7

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